Wim owns a lot of very nice and some very rare calculators. They all come with a description and lots of perfect photo’s, also of the internals of each machine. For some there is a video.
His site also contains detailed information regarding the many different technologies used in mechanical calculators.
Contains a large data base of mechanical calculators. Available in four languages.
Contains a large data base of vintage electronic calculators.
Contains a lot of information about mechanical as well as electronic calculators. If you are interested in company history or working principles, don’t, don’t miss this site. If you want to try a repair, look at the Technical and Reference Section. It’s very very helpful.
Contains a large data base of electronic calculators
Thanks to all those collectors who took care of making so much knowledge and experience available to all of us.
A yearly printed overview of relevant office equipment available in that year in Germany. Most calculators are mentioned with there price.
This site contains HTML-versions of some original documents related to the early history of calculators. It includes many manuals.
Contains a large collection of mechanical calculators. For many calculators it includes a description how to use it.
A very interesting site with a lot of information about high-end mechanical calculators. It also contains easy-to-understand drawings regarding common main working principles.
Robert Mařík’s site contains interesting as well as funny stuff regarding mechanical calculators and calculations on such machines.
A very large collection of ink ribbons and other calculator and typewriter related supplies can be ordered from this web shop. There is a Dutch webshop, another one in English on Etsy and there is a presence on German Ebay.
I ordered ribbons several times and experienced fine communication, fast delivery and a high level of user friendliness each time. The actual collection is much larger than shown on these web sites. If you can’t find what you’re looking for or are not sure which product fits your machine, ask for help.
The site “Aus der Rechenmaschinen-Werkstatt von Detlev Bölter” contains lots of information, mostly about early mechanical calculators.
|Bohn Contex 55|
|Friden EC 1117|
|Hamann Manus R|
|LLoyds Accumatic 55|
|MBO TRS 1300P|
|TI SR56 & PC100A|